Method for differential temperature rolling of composite strips based on actions of friction roller and device thereof

Abstract

A method for differential temperature rolling of composite strips based on actions of a friction roller includes steps of: S1: preparing a metal strip to be bonded, and performing surface treatment on the metal strip to be bonded; S2: frictionally heating the metal strip to be bonded by several sets of friction roller heating devices; measuring a surface temperature of the friction-heated metal strip to be bonded strip by a temperature detector; according to a measured temperature, adjusting a rotation speed of the friction roller in the friction roller heating devices; and S3: transporting the heated metal strip to be bonded to a rolling mill for rolling to obtain a metal composite strip. The invention adopts the friction roller heating devices in rolling process of the metal strip to be bonded.

What is claimed is: 
     
       1. A method for differential temperature rolling of composite strips based on actions of a friction roller, comprising steps of:
 S 1 : preparing a metal strip to be bonded ( 2 ), and performing surface treatment on the metal strip to be bonded ( 2 ); 
 S 2 : frictionally heating the metal strip to be bonded ( 2 ) by a plurality of sets of friction roller heating devices ( 3 ), measuring a surface temperature of the friction-heated metal strip to be bonded ( 2 ) by a temperature detector ( 4 ); according to a measured temperature, adjusting a rotation speed of the friction roller ( 9 ) in the friction roller heating devices ( 3 ); the friction roller is a high-speed rotating roller with a rotation speed in a range of 2000-20000 r/min, utilizing a friction and heat generation effect of the friction roller ( 9 ) rotating at a high speed with the metal strip ( 2 ) to be bonded, heating both sides of the metal strip ( 2 ) to be bonded or an independent heating of the metal strip to be bonded on one side by adjusting the speed of the friction roller ( 9 ), thereby generating different temperature rises to realize the differential temperature rolling of the metal strip ( 2 ) to be bonded, each friction roller heating device of the plurality of sets of friction roller heating devices contains an upper friction roller and a lower friction roller, and that each friction roller meets all limitations described in the step S 2  mentioned above, a surface roughness of each of the upper friction roller and the lower friction roller in the friction roller heating devices ( 3 ) is different, and different friction coefficients are produced when they contact the upper and lower surfaces of the metal strip ( 2 ) to be bonded; combining pressing of the friction roller ( 9 ) and the high-speed rotation, the metal strip ( 2 ) to be bonded forms a temperature gradient along a thickness direction, a direction of a friction force acting on the metal strip ( 2 ) to be bonded by the friction roller ( 9 ) is opposite to a rolling direction, which generates tension and reduces a thickness of the metal strip ( 2 ) to be bonded, coordinately controlling the tension by displacement, the rotation speed and the surface roughness of the friction roller ( 9 ); 
 S 3 : transporting the metal strip to be bonded ( 2 ) heated to a rolling mill ( 6 ) for rolling to obtain a metal composite strip, wherein a rotation direction of the friction roller ( 9 ) in the step S 2  is opposite to a rotation direction of a roller of the rolling mill ( 6 ) 
 wherein a diameter and surface roughness of the two friction rollers ( 9 ) in a same one of the friction roller heating devices ( 3 ) are different; 
 wherein each of the friction roller heating devices ( 3 ) in step S 2  comprises two brackets ( 11 ), two bearing seats ( 8 ) are respectively provided in the two brackets ( 11 ), and a first bearing seat of the bearing seats ( 8 ) at a lower part is fixedly provided, a second bearing seat of the bearing seats ( 8 ) at an upper part is movably provided; an upper surface of the second seat of the bearing seats ( 8 ) located in the upper part is connected with a pressing down device ( 10 ), wherein the pressing down device ( 10 ) is installed on the two brackets ( 11 ), and the friction rollers ( 9 ) are provided in the bearing seats ( 8 ) corresponded on the two brackets ( 11 ), an end of the friction rollers ( 9 ) is connected to an output shaft of a reducer ( 13 ) through a cardan shaft ( 12 ), and an input shaft of the reducer ( 13 ) is connected with an output shaft of a motor ( 14 ); 
 wherein an included angle between an axial direction of the friction roller ( 9 ) in the friction roller heating device ( 3 ) and a rolling direction of the metal strip ( 2 ) to be bonded is greater than 0° and less than or equal to 90°. 
 
     
     
       2. The method for differential temperature rolling of the composite strips based on actions of the friction rollers according to  claim 1 , wherein a pressing action of the friction roller ( 9 ) on the metal strip ( 2 ) to be bonded is within a range of elastic deformation of the metal strip ( 2 ) to be bonded.